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TB Relapse?

My dad was diagnosed with TB of spine about a year ago. He had surgery and then was put on anti-TB medication. About 8 months later his spine has got better but, while he's still on TB medication his lymph node has swollen and this has been diagnosed as related to TB. Does this indicate return of TB or just that the bacteria is not completely dead and it will take a few more months of medication to kill it?
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